src/core/stringextra.c

   1 /*
   2  *  Copyright (C) 1991, 1992  Linus Torvalds
   3  *  Copyright (C) 2004 Tobias Lorenz
   4  *
   5  *  string handling functions
   6  *  based on linux/lib/string.c
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 FILE_LICENCE ( GPL2_ONLY );
  14
  15 /*
  16  * stupid library routines.. The optimized versions should generally be found
  17  * as inline code in <asm-xx/string.h>
  18  *
  19  * These are buggy as well..
  20  *
  21  * * Fri Jun 25 1999, Ingo Oeser <ioe@informatik.tu-chemnitz.de>
  22  * -  Added strsep() which will replace strtok() soon (because strsep() is
  23  *    reentrant and should be faster). Use only strsep() in new code, please.
  24  */
  25
  26 /*
  27  * these are the standard string functions that are currently not used by
  28  * any code in etherboot. put into a separate file to avoid linking them in
  29  * with the rest of string.o
  30  * if anything ever does want to use a function of these, consider moving
  31  * the function in question back into string.c
  32  */
  33
  34 #include <stdint.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <ctype.h>
  38
  39 /* *** FROM string.c *** */
  40
  41 #ifndef __HAVE_ARCH_STRPBRK
  42 /**
  43  * strpbrk - Find the first occurrence of a set of characters
  44  * @cs: The string to be searched
  45  * @ct: The characters to search for
  46  */
  47 char * strpbrk(const char * cs,const char * ct)
  48 {
  49         const char *sc1,*sc2;
  50
  51         for( sc1 = cs; *sc1 != '\0'; ++sc1) {
  52                 for( sc2 = ct; *sc2 != '\0'; ++sc2) {
  53                         if (*sc1 == *sc2)
  54                                 return (char *) sc1;
  55                 }
  56         }
  57         return NULL;
  58 }
  59 #endif
  60
  61 #ifndef __HAVE_ARCH_STRSEP
  62 /**
  63  * strsep - Split a string into tokens
  64  * @s: The string to be searched
  65  * @ct: The characters to search for
  66  *
  67  * strsep() updates @s to point after the token, ready for the next call.
  68  *
  69  * It returns empty tokens, too, behaving exactly like the libc function
  70  * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
  71  * Same semantics, slimmer shape. ;)
  72  */
  73 char * strsep(char **s, const char *ct)
  74 {
  75         char *sbegin = *s, *end;
  76
  77         if (sbegin == NULL)
  78                 return NULL;
  79
  80         end = strpbrk(sbegin, ct);
  81         if (end)
  82                 *end++ = '\0';
  83         *s = end;
  84
  85         return sbegin;
  86 }
  87 #endif